Internal air chamber air-heating furnace



p 1953 w. E. LONGWORTH ET AL ,823

INTERNAL AIR CHAMBER AIR-HEATING FURNACE Filed July 6. 1950 24 Fig, 2

biz/enters 4. William E. Longwarfh 32 Robert A. Longwarlh Patented Sept. 22, 1953 UNITED STATES PATENT OFFICE INTERNAL AIR CHAIWBER AIR-HEATING FURNACE William E. Longworth, Rock Tavern, and

Robert A. Longworth, Middletown, N. Y.

Application July 6, 1950, Serial No. 172,302

This invention relates to a device which can be readily and removably positioned Within a furnace or space heater for conducting a draft of air therethrough and producing heated air to be circulated through various parts of a house.

The primary object of this invention is to provide hot air heaters which are relatively simple in design and construction, inexpensive to manufacture, very easy to assemble and remove from a conventional furnace, and which are very eflicient for heating a draft of air for subsequent delivery through various parts of a house.

A further important object of this invention is to provide air heaters in the form of circular tubes equipped with a novel means for removably securing the same in proper position within a furnace.

A further important object of this invention is to provide a tubular air heater of the character described which includes integral inlet and outlet pipes that can be readily and removably secured to a forced air inlet conduit and a hot air delivery conduit respectively with a minimum of effort and manipulation.

Yet another object of this invention is to provide a tubular air heater of the character described so constructed that it can be positioned within a furnace in such a manner that the outlet conduit can be disposed at any position relative to the shell of the furnace as desired.

These, together with various ancillary objects and features of the invention which will later become apparent as the following description proceeds, are attained by the device, a preferred embodiment of which has been illustrated by way of example only in the accompanying drawings, wherein:

Figure 1 is a vertical sectional View through a furnace and through the air heaters of the present invention, some parts being shown in elevation; and

Figure 2 is a side elevation of one of the tubular heaters per se.

Specific reference is now made to the drawings. In the several views in the accompanying drawings and in the following specification reference characters indicate corresponding elements throughout.

Indicated generally at In is a conventional furnace including a double walled shell I2 having asbestos insulation 14 between the walls, a combustion chamber [6, a fume vent I8 to the rear of the furnace, a fire box 20 at the bottom of the furnace, and a fuel delivery pipe 22 lead- 3 Claims. (Cl. 126110) ing to the fire box. The furnace is of conventional design and construction and does not form a part of the present invention.

The present invention consists of a pair of tubular members for disposition within the above chamber l6 of the furnace, and since both of the tubular members are of identical construction and design, only one will be completely described herein. The tubular member is a hollow circular pipe 24 fabricated of the best boiler gauging metal, and Welded to the outer surface of the circular tube is a plurality of circumferentially spaced radially extending rectangular fins or bafiie plates 26. Welded or otherwise secured to the circular tube 24 at diametrically opposed points are outwardly extending bolts 23 which are made to extend through the shell l2 of the furnace, the bolts being threaded at their ends to receive closure nuts 38 so that both of the tubes may be readily positioned within the furnace and attached thereto from the outside thereof. Welded or otherwise secured to the outer surface of the circular tube 24 and surrounding the bolts are short pipe sections 32 which serve as spacers to maintain the tube in desired spaced relationship to the inner Wall of the shell i2. Thus the tube "can be readily and removably secured within the furnace in proper position with a minimum of manipulation and effort.

Welded or otherwise secured to the outer surface of each tube 24 and extending outwardly therefrom are a pair of pipes 34 and 36 which are made to extend through the shell l2 and are provided at their free ends with external threads 38 and 40. The pipe section 36 is an inlet pipe which is made to engage an internally threaded conduit or pipe 42 secured to a conventional blower or fan 44 having an air inlet pipe 45, the forced air conduit 42 being provided with an air pick up pipe 46 having a damper control 48 therein, the air pick up pipe being used particularly without the blower. Pipe sections 34 are hot air outlet pipes and are removably received in internally threaded hot air conduits 50 disposed exteriorly of the furnace and which lead through various parts of the building for conveying hot air thereto. It will be seen that the conduits 42 and 50 so threadedly engage the pipes 34 and 36 that they abut the outer wall of the shell l2 to lend further support to the air heater tube 24 Within the furnace. If desired, a Water conducting coil 52 may be disposed within the furnace as shown clearly in Figure 1.

It will be seen that air heaters are provided which are simple in construction and readily adapted for removable assembly within a furnace, the attachment to the shell being accomplished entirely from the outside of the furnace. The air heaters may be positioned in any manner in the furnace so that the hot air conduits extend from the furnace in any position relative to the shell.

While it is understood that but one air heater may be employed to advantage, a pair of heaters improves the efiiciency of the device. When a pair of heaters are employed, as shown in the drawings, they should be interconnected. Accordingly, each circular pipe 24 includes a laterally extending pipe section disposed between a pair of fins 26 and carrying an integral annular flange 56 at its free end. The flanges 55 are appropriately bolted together as at 58 to complete the connection.

In view of the foregoing description taken in conjunction with the accompanying drawings it is believed that a clear understanding of the device will be quite apparent to those skilled in this art. A more detailed description is accordingly deemed unnecessary.

Having described the invention, what is claimed as new is:

1. In a furnace including an insulated shell, an air heater comprising a pair of spaced parallel circularly annular tubes in said furnace with principal planes thereof extending vertically, means for removably securing said tubes in said furnace, and circumferentially spaced baffles extending radially from the outer surfaces of said tubes, each tube including diametrically opposed, outwardly extending, threaded inlet and Outlet pipes passing through said shell and adapted to be removably secured to a forced air and a hot air conduit, respectively, said means including, a pair of diametrically Opposed outwardly extending bolts carried by each tube extending through said shell, said bolts having threaded ends, and closure nuts received on said threaded ends.

2 In a furnace including an insulated shell, an air heater comprising a circularly annular tube disposed in said furnace with a principal plane thereof extending vertically, said tube including circumferentially spaced baffles extending radially from the outer surface of said tube, a pair of diametrically opposed bolts carried by and extending outwardly from one side of said tube, said bolts having threaded ends extending through said shell, closure nuts received on said threaded ends, spacer sleeves on said bolts terminally abutting said tube and the inner surface of said shell, outwardly extending threaded inlet and outlet pipes carried by said tube adjacent Said bolts and passing through said shell, a hot air conduit internally threaded at one of its ends engaging said outlet pipe and bearing against the outer surface of said shell and a forced air conduit internally threaded at one of its ends engagi said inlet pipe and bearing against the outer surface of said shell.

:3, In a furnace including an insulated shell, an air heater comprising a circularly annular tube in said furnace having a principal plane thereof disposed vertically, said tube including circumferentially spaced baffles extending radially from the outer surface thereof, a pair of diametrically opposed bolts carried by and extending outwardly from one side of said tube, said bolts having threaded ends extending through said shell, closure nuts received on said thread-ed end, spacer sleeves on said bolts terminally abutting said tube and the inner surface of said shell, out- Wardly extending inlet and outlet pipes carried by said tube adjacent said bolts and passing through said shell, a hot air conduit and a forced air conduit connected to said outlet and inlet pipes, respectively.

WILLIAM E. LONGWORTH. RQBER'I A. LONGWORTH.

References Cited in the file of this patent 

